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首页> 外文期刊>IEEE Transactions on Microwave Theory and Techniques >Development of a 2.45-GHz Local Exposure System for In Vivo Study on Ocular Effects
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Development of a 2.45-GHz Local Exposure System for In Vivo Study on Ocular Effects

机译:2.45 GHz局部曝光系统的开发,可用于体内眼动研究

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We developed a new exposure system to irradiate microwaves locally on a rabbit eye using a small coaxial-to-waveguide adapter filled with low-loss dielectric material as an antenna. A numerical rabbit model was also developed using X-ray computer tomography images, and the specific absorption rates (SARs) in the rabbit, especially in the eye, were analyzed with the finite-difference time-domain method. The temperature elevation in the exposed eye was also evaluated by solving a bioheat equation. Our exposure system can generate incident power density of 15 mW/cm2 at the surface of a rabbit eye with input power of 1 W. When the incident power density on the rabbit eye is 300 mW/cm2 , average SAR over the exposed eye and the whole body were approximately 108 and 1.8 W/kg, respectively. The exposure system can realize localized exposure to the eye with the ratio of exposed-eye averaged SAR to the whole-body averaged SAR was 60. The developed exposure system can achieve high-intensity exposure such as the threshold of cataracts, i.e., the eye-averaged SAR over 100 W/kg or the lens temperature over 41 degC with the incident power density of 300mW/cm2 without significant whole-body thermal stresses
机译:我们开发了一种新的曝光系统,它使用装满低损耗电介质材料的小型同轴转波导适配器作为天线,在兔子的眼睛上局部照射微波。还使用X射线计算机断层扫描图像开发了数值兔子模型,并使用时域有限差分法分析了兔子(尤其是眼睛)中的比吸收率(SAR)。还通过求解生物热方程来评估裸眼中的温度升高。我们的曝光系统可以在输入功率为1 W的情况下在兔眼表面产生15 mW / cm2的入射功率密度。当兔眼的入射功率密度为300 mW / cm2时,裸眼和全身分别约为108和1.8 W / kg。该曝光系统可实现眼睛局部SAR与全身平均SAR之比为60。开发的曝光系统可实现高强度曝光,例如白内障阈值,即眼睛平均SAR超过100 W / kg或透镜温度超过41 degC,入射功率密度为300mW / cm2,而没有明显的整体热应力

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